Camp master 'heavy duty' chair

I bought an expensive camp master chair, used it once and it broke. I Returned it, bought a more expensive one, used it once AND IT BROKE AGAIN. I don't have the cash slip and my bank statement doesn't show it brcause i paid it cash and with the voucher orf thr previously returned voucher. Now you want me to take back for them to send it in for repairs! This is ridiculously!